共查询到20条相似文献,搜索用时 0 毫秒
1.
Jiang Deyi Zhang Guangyang Hu Yaohua Liu Liping 《保鲜与加工》1997,(5):22-25
The affection to the permeability of the gas of coal layers by the effective stress is studied and the relationship between the permeability and the effective stress which is a three order polynomial is derived and is verified by experiment. 相似文献
2.
It is very important to mine safe exploitation, gas drawing and predict of coal and gas outburst that adsorption characteristics of coal to gas in geophysical field are studied. Adsorption and desorption characteristics of coal to gas in geophysical field have been reviewed in detail, then it is obtained that adsorption characteristics of coal to gas in electromagnetic field should be further studied . Adsorption and desorption characteristics of coal to methane in alternating electric field (AEF) have been studied mainly. Adsorption characteristics of three coal samples in AEF have been studied by means of Volume Method. The result shows that chemical properties and matter constituent of coal surface are no changed , adsorption and desorption of the coal samples in AEF well accord with Langmuir equation and two constants empirical formula, and because coal potential energy is increased and coal temperature is raised caused by Joule heat effect , adsorption ability of coal is decreased, and the desorption process is slowed down in AEF. 相似文献
3.
4.
鲜枣脯真空渗糖技术影响因素的研究 总被引:1,自引:0,他引:1
通过对枣脯的真空渗糖技术及其影响因素进行系统的研究,结果表明:当真空度控制在0.080MPa,维持真空时间为30分钟、充气时间为60分钟;加糖采用喷糖方式、糖液的温度为95摄氏度时,为枣脯真空渗糖的最佳条件。 相似文献
5.
6.
以菠萝为原料,采用变温压差膨化干燥技术,探讨了膨化工艺中预干燥温度、预干燥时间、膨化压力、膨化温度、停滞时间、抽空温度及抽空时间等7个因素对菠萝膨化产品的含水率、色泽、硬度及脆度的影响。研究结果表明,菠萝产品的硬度和脆度主要受预干燥时间、膨化压力和温度、停滞时间及抽空时间等因素的影响;含水量主要受预干燥温度和时间、膨化温度、抽空温度和时间等因素的影响;而色泽主要受预干燥温度和时间、膨化温度、停滞时间、抽空温度和时间的影响。综合各方面因素考虑,本研究确定的最适预干燥温度为80℃,预干燥时间为8h,膨化压力为0.1MPa,膨化温度为110℃,停滞时间为5min,抽空温度为70℃,抽空时间为3h。 相似文献
7.
浅析农田温室气体排放的影响因素 总被引:1,自引:1,他引:1
本文论述了三种主要温室气体排放的研究进展以及农田温室气体排放的影响因素。结果表明农田温室气体排放受肥料、耕作方式、土壤水分、温度、质地、有机质、地膜覆盖、机械化操作等多种因素影响。针对农田温室气体减排应主要从减少排放、加强移除、替代(避免)排放等3方面着手,因地制宜,发展新型肥料、合理灌溉、科学地耕作和管理土壤,实现增产增汇减排的可持续发展农业。 相似文献
8.
9.
为了提高牛体细胞克隆的效率,比较了不同融合电压对核移植胚发育的影响,其中1.7kv/cm电场强度,获得了较高的融合率、卵裂率和囊胚率,分别为67.14%,76.59%和29.16%。比较了血清饥饿处理体细胞对核移植效率的影响,血清饥饿处理体细胞后,融合率、卵裂率和囊胚率分别为68.91%,74.79%和28.26%,与非血清饥饿处理的相比没有明显差异(分别为60.96%,71.91%和20.31%,P>0.05)。而且胚胎移植后的怀孕率和产犊率也没有差异(分别为29.17%,8.33%和33.33%,16.66%,P>0.05)。另外,通过加强克隆牛的产后护理,可以提高克隆牛的成活率。总之,优化生产克隆牛的各环节因素,可以从整体上提高克隆牛的生产效率。 相似文献
10.
PENG Xuya JI Fangying XIAO Bo LIU Guotao 《保鲜与加工》1999,(6):66-69
On the basis of analyzing the landfill gas production and its affecting factors, the methods for accelerating the production of landfill gas and settlement of landfill site are put forward in this paper. 相似文献
11.
Gas loss is serious in current coal core method, and freezing core technology will become a new direction for gas content determination in the future, so it is the key to study gas desorption characteristics in low temperature environment (below 0℃). Therefore, in this paper, a self-made high/low temperature gas adsorption/desorption device is used to test gas desorption laws in low temperatures (-10, -20 and -30 ℃). The tested results show that the effect of temperature on gas desorption is very obvious. When temperature decreases, gas adsorption quantity increases; while gas desorption quantity decreases as temperature decreases. Lowering temperature suppresses gas desorption. And the lower the temperature is, the more obvious the gas desorption inhibitory effect is. Increasing gas pressure weakens gas desorption inhibitory effect in low temperature environment. 相似文献
12.
选用‘红星’、‘美红’、‘荷红’、‘全家红’4个品种的花粉作为试材,分别通过染色法(TTC、过氧化物酶法)和离体萌发法来测定苹果花粉的生活力,并通过花粉离体萌发、生长试验,观察其在不同培养条件下的萌发生长状况。结果表明:染色及离体培养试验中,品种间花粉活力存在较大差异,其中‘红星’花粉生活力最高,‘美红’、‘荷红’次之,‘全家红’最低;离体萌发试验中,不同培养条件下各种花粉的萌发及花粉管生长随温度、浓度的增加均呈先增后减趋势;不同温度条件下,花粉萌发生长最适培养基浓度不同,高浓度(15%、20%)的培养环境对花粉的萌发生长有一定抑制作用;试验还发现,各花粉最高萌发率与花粉管最大长度生长条件不一致,花粉管的生长最适温度及培养浓度均高于萌发最适条件,这可能与花粉管萌发生长时新陈代谢旺盛有关。 相似文献
13.
14.
In this paper,the concept,types and mechanism of activated sludge bulking were introduced.The factors affecting the sludge bulking were discussed from the aspects of wastewater quality,such as wastewater with high content of carbon hydrate,decayed wastewater,wastewater with toxic substance,wastewater with unbalanced content of N and P and wastewater with low pH value;the environment conditions such as flowing state of the flow,operation manner,variation of water quality and other factors(pH,temperature,nutrition) etc.And also,the emergency controlling,environment controlling and process operating controlling methods are put forward for controlling activated sludge bulking. 相似文献
15.
16.
贷款难问题是制约绥化市农民专业合作社发展的瓶颈,本文基于绥化市农民专业合作社的调查数据,对影响农民专业合作社贷款的因素进行实证分析并提出相应的政策建议。分析结果发现,经营能力、无形资产、银社关系、社长个人特征以及外部环境是影响绥化市农民专业合作社贷款的主要因素,其中经营能力对合作社贷款的获得主要体现在固定资产规模这一因素上,无形资产对合作社是否获得贷款影响不明显,银社关系、社长经历以及外部环境对合作社能否获得信贷有一定程度影响。因此,本文有针对性地提出加大政府倾斜和财政支持力度、加强农村金融机构的服务职能等政策建议。 相似文献
17.
18.
19.
20.
镧对油菜种子透性及种子活力的影响 总被引:2,自引:0,他引:2
本文以油菜种子为材料,研究了稀土镧对油菜种子透性和种子活力的影响。在0.05-2.00mol/L水平,La^3+降低种子细胞内的电解质,K^+,Ca^2+和Na^+的相对外渗量,并表现为随La^3+浓度的增加而下降。低于0.1mol/L降低糖的相对外渗量,高于此浓度糖的相对外渗量升高。 相似文献